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The first example of fluorescence of the solid individual compounds of Eu 2+ ion: EuCl 2 , EuI 2 , EuBr 2
Author(s) -
Galimov D.I.,
Bulgakov R.G.
Publication year - 2019
Publication title -
luminescence
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.428
H-Index - 45
eISSN - 1522-7243
pISSN - 1522-7235
DOI - 10.1002/bio.3580
Subject(s) - ion , chemistry , halide , excited state , fluorescence , analytical chemistry (journal) , emission spectrum , europium , ultraviolet , spectral line , excitation , atomic physics , inorganic chemistry , physics , optics , organic chemistry , chromatography , astronomy , quantum mechanics
Abstract Fluorescence (FL) from Eu 2+ ion solid individual compounds was observed for the first time using the examples EuCl 2 , EuI 2 and EuBr 2 . Fluorescence was detected at excitation by ultraviolet (UV) light from powdered samples of Eu (II) halides at room temperature (RT) in an argon atmosphere. In air, FL of all Eu 2+ compounds studied was stable, and intensity persisted for weeks. Depending on the nature of the halide anion and due to a nephelauxetic effect, the position of the maxima in the FL spectra underwent a red shift in the series: EuCl 2 (409 nm) < EuBr 2 (428 mm) < EuI 2 (432 nm). The lifetimes of the excited states of the Eu 2+ * ions for EuI 2 , EuCl 2 and EuBr 2 were 355, 76 and 54 ns, respectively.